I could've swore about two decades ago the e46s and the like had an automatic brake drying feature. That based on the rain sensor while driving - it would pulsate against the rotors to keep them dry.
I don't remember the three-letter-acronym for it. Driving me nuts trying to remember. Anyone else remember this?
I also miss the early days of BMW's website, where they had a technology glossary - and every single one of their features was listed out and what they did (e.g. DSC III, Dynamic Cornering, etc)